Extension spring

Coil spring for tensile force

Coil spring for tensile force

Extension spring

An extension spring is a coil spring that generates a counterforce for tensile force. The force of the extension springs increases linearly based on the stretched distance. The extension spring differs from compressed coil springs in that the extension spring itself may have initial tension. Initial tension means that the extension spring must be stretched with a specific force before it starts increasing in length. Extension springs are used in, for example, door locks and agricultural machinery.

Extension spring characteristics

extension springs have a linear spring rate

generate a counterforce for tensile force

can be made with German hooks or English loops

can also be made with high hooks for narrow attachment points

a narrow section of straight wire can be put in the middle of a spring; these are used for example in brake springs

materials include spring steel, oil-quenched spring steel and galvanised, stainless and acid-proof spring wire as well as other special steels, such as heat-resistant spring steel

wire diameters can range between 0.2 and 20.0 mm

Contact us early, during the product design stage, and we will get your springs straightened out. Explore our extension spring selection below and request a quote.